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Determination of non-steroidal anti-inflammatory drugs in urine by the combination of stir membrane liquid–liquid–liquid microextraction and liquid chromatography

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Abstract

A stir membrane liquid phase microextraction procedure working under the three-phase mode is proposed for the first time for the determination of six anti-inflammatory drugs in human urine. The target compounds are isolated and preconcentrated using a special device that integrates the extractant and the stirring element. An alkaline aqueous solution is used as extractant phase while 1-octanol is selected as supported liquid membrane solvent. After the extraction, all the analytes are determined by liquid chromatography (LC) with ultraviolet detection (UV). The analytical method is optimized considering the main involved variables (e.g., pH of donor and acceptor phases, extraction time, stirring rate) and the results indicate that the determination of anti-inflammatory drugs at therapeutic and toxic levels is completely feasible. The limits of detection are in the range from 12.6 (indomethacin) to 30.7 μg/L (naproxen). The repeatability of the method, expressed as relative standard deviation (RSD, n = 5) varies between 3.4 % (flurbiprofen) and 5.7 % (ketoprofen), while the enrichment factors are in the range from 35.0 (naproxen) to 72.5 (indomethacin).

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Acknowledgments

Financial support from the Spanish Ministry of Science and Innovation (Grant CTQ2011-23790) is gratefully acknowledged. One of the authors (S.R.) wishes to thank the University of Cordoba and Fundación Carolina (Master in advanced fine chemistry) for the financial support provided during the development of this work.

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Authors and Affiliations

  1. Department of Analytical Chemistry, Institute of Fine Chemistry and Nanochemistry, University of Cordoba, Marie Curie building (Annex), Campus de Rabanales, 14071, Cordoba, Spain

    S. Riaño, M. C. Alcudia-León, R. Lucena, S. Cárdenas & M. Valcárcel

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  1. S. Riaño
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  2. M. C. Alcudia-León
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  3. R. Lucena
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  4. S. Cárdenas
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  5. M. Valcárcel
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Correspondence to M. Valcárcel.

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Riaño, S., Alcudia-León, M.C., Lucena, R. et al. Determination of non-steroidal anti-inflammatory drugs in urine by the combination of stir membrane liquid–liquid–liquid microextraction and liquid chromatography. Anal Bioanal Chem 403, 2583–2589 (2012). https://doi.org/10.1007/s00216-012-6051-2

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  • DOI: https://doi.org/10.1007/s00216-012-6051-2

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